PCA9548A Series
8-channel 2.3- to 5.5-V I2C/SMBus switch with reset & voltage translation
Manufacturer: Texas Instruments
Catalog
8-channel 2.3- to 5.5-V I2C/SMBus switch with reset & voltage translation
Key Features
• 1-of-8 Bidirectional Translating SwitchesI2C Bus and SMBus CompatibleActive-Low Reset InputThree Hardware Address Pins for Use of up to Eight PCA9548A Devices on the I2C BusChannel Selection Via I2C BusPower-Up with All Switch Channels DeselectedLow RONSwitchesAllows Voltage-Level Translation Between 1.8-V, 2.5-V, 3.3-V, and 5-V BusesNo Glitch on Power UpSupports Hot InsertionLow Standby CurrentOperating Power-Supply Voltage Range of 2.3 V to 5.5 V5-V Tolerant Inputs0-kHz to 400-kHz Clock FrequencyLatch-Up Performance Exceeds 100 mA Per JESD 78, Class IIESD Protection Exceeds JESD 222000-V Human-Body Model (A114-A)200-V Machine Model (A115-A)1000-V Charged-Device Model (C101)1-of-8 Bidirectional Translating SwitchesI2C Bus and SMBus CompatibleActive-Low Reset InputThree Hardware Address Pins for Use of up to Eight PCA9548A Devices on the I2C BusChannel Selection Via I2C BusPower-Up with All Switch Channels DeselectedLow RONSwitchesAllows Voltage-Level Translation Between 1.8-V, 2.5-V, 3.3-V, and 5-V BusesNo Glitch on Power UpSupports Hot InsertionLow Standby CurrentOperating Power-Supply Voltage Range of 2.3 V to 5.5 V5-V Tolerant Inputs0-kHz to 400-kHz Clock FrequencyLatch-Up Performance Exceeds 100 mA Per JESD 78, Class IIESD Protection Exceeds JESD 222000-V Human-Body Model (A114-A)200-V Machine Model (A115-A)1000-V Charged-Device Model (C101)
Description
AI
The PCA9548A device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C slave address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.
The system master can reset the PCA9548A in the event of a time-out or other improper operation by asserting a low in theRESETinput. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. AssertingRESETcauses the same reset and initialization to occur without powering down the part. This allows recovery should once of the downstream I2C buses get stuck in a low state.
The pass gates of the switches are constructed so that the VCCpin can be used to limit the maximum high voltage, which is passed by the PCA9548A. This allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V or 3.3-V parts can communicate with 5-V parts, without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.
The PCA9548A device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register. These downstream channels can be used to resolve I2C slave address conflicts. For example, if eight identical digital temperature sensors are needed in the application, one sensor can be connected at each channel: 0-7.
The system master can reset the PCA9548A in the event of a time-out or other improper operation by asserting a low in theRESETinput. Similarly, the power-on reset deselects all channels and initializes the I2C/SMBus state machine. AssertingRESETcauses the same reset and initialization to occur without powering down the part. This allows recovery should once of the downstream I2C buses get stuck in a low state.
The pass gates of the switches are constructed so that the VCCpin can be used to limit the maximum high voltage, which is passed by the PCA9548A. This allows the use of different bus voltages on each pair, so that 1.8-V, 2.5-V or 3.3-V parts can communicate with 5-V parts, without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.
